Added the FlashComponent in to GUI 2

Change-Id: I80923759cc70dbd902e478a5ad995621543d29f1
diff --git a/web/gui2/src/main/webapp/app/fw/layer/flash/flash.component.ts b/web/gui2/src/main/webapp/app/fw/layer/flash/flash.component.ts
new file mode 100644
index 0000000..3a70c35
--- /dev/null
+++ b/web/gui2/src/main/webapp/app/fw/layer/flash/flash.component.ts
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { Component } from '@angular/core';
+import { LogService } from '../../../log.service';
+import { trigger, state, style, animate, transition } from '@angular/animations';
+
+/**
+ * ONOS GUI -- Layer -- Flash Component
+ *
+ * Replaces Flash Service in old GUI.
+ * Provides a mechanism to flash short informational messages to the screen
+ * to alert the user of something, e.g. "Hosts visible" or "Hosts hidden".
+ *
+ * To use add an element to the template like
+ *   <onos-flash #flashComponent (click)="flashComponent.flash('Hosts visible')"></onos-flash>
+ * 1) The (click) can be removed and the call to flash() can be called from anywhere else in the template.
+ * 2) This whole element can be disabled until needed with an ngIf
+ */
+@Component({
+    selector: 'onos-flash',
+    templateUrl: './flash.component.html',
+    styleUrls: ['./flash.component.css'],
+    animations: [
+        trigger('flashState', [
+            state('inactive', style({
+                opacity: '0.0',
+            })),
+            state('active', style({
+                opacity: '1.0',
+            })),
+            transition('inactive => active', animate('200ms ease-in')),
+            transition('active => inactive', animate('200ms ease-out'))
+        ])
+    ]
+})
+export class FlashComponent {
+    public message: string;
+
+    public width: string = '100%';
+    public height: number = 200;
+    public rx: number = 10;
+    public vbox: string = '-200 -' + (this.height / 2) + ' 400 ' + this.height;
+    public xpad: number = 20;
+    public ypad: number = 10;
+    public enabled: boolean = false;
+
+    constructor(
+        private log: LogService,
+    ) {
+        this.log.debug('FlashComponent constructed');
+    }
+
+    /**
+     * Flash a message up for 1200ms then disappear again.
+     * See animation parameter for the ease in and ease out params
+     */
+    flash(message: string): void {
+        this.message = message;
+        this.enabled = true;
+
+        setTimeout(() => {
+            this.enabled = false;
+        }, 1200);
+    }
+}